Fish is considered one of the most nutritious foods for human health due to its rich composition of proteins, omega-3 fatty acids, vitamins, minerals and bioactive compounds. Fish proteins possess high digestibility and contain all essential amino acids required for growth, tissue repair and maintenance of body functions. Fish lipids are rich in omega-3 fatty acids such as eicosapentaenoic acid (EPA) and docosahexaenoic acid (DHA), which contribute significantly to cardiovascular protection, brain development, anti-inflammatory responses and neurological health. Fish also contains important micronutrients including calcium, selenium, iodine, iron, phosphorus, zinc and vitamins A and D that support bone health, immunity, thyroid function, blood formation and metabolic regulation. Recent studies have further highlighted the role of fish-derived bioactive compounds and peptides that possess antioxidant, antimicrobial, antihypertensive, neuroprotective and wound-healing properties. In addition to its nutritional importance, fish contributes significantly to food security, livelihood generation and sustainable nutrition globally. Despite these benefits, fish consumption remains low in several developing countries because of lack of awareness and dietary preferences. Therefore, increasing awareness regarding the health and nutritional significance of fish can improve public health and nutritional security worldwide.